US7856891B2 - Method for operating a measuring device arranged on a rotating, carousel-type, filling machine - Google Patents

Method for operating a measuring device arranged on a rotating, carousel-type, filling machine Download PDF

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US7856891B2
US7856891B2 US12/382,883 US38288309A US7856891B2 US 7856891 B2 US7856891 B2 US 7856891B2 US 38288309 A US38288309 A US 38288309A US 7856891 B2 US7856891 B2 US 7856891B2
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measuring
measuring transducer
class
transducer
primary signal
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US20090249890A1 (en
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Michael Kirst
Jörg Herwig
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Endress and Hauser Flowtec AG
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Endress and Hauser Flowtec AG
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B67—OPENING, CLOSING OR CLEANING BOTTLES, JARS OR SIMILAR CONTAINERS; LIQUID HANDLING
    • B67C—CLEANING, FILLING WITH LIQUIDS OR SEMILIQUIDS, OR EMPTYING, OF BOTTLES, JARS, CANS, CASKS, BARRELS, OR SIMILAR CONTAINERS, NOT OTHERWISE PROVIDED FOR; FUNNELS
    • B67C3/00—Bottling liquids or semiliquids; Filling jars or cans with liquids or semiliquids using bottling or like apparatus; Filling casks or barrels with liquids or semiliquids
    • B67C3/02—Bottling liquids or semiliquids; Filling jars or cans with liquids or semiliquids using bottling or like apparatus
    • B67C3/20—Bottling liquids or semiliquids; Filling jars or cans with liquids or semiliquids using bottling or like apparatus with provision for metering the liquids to be introduced, e.g. when adding syrups
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B67—OPENING, CLOSING OR CLEANING BOTTLES, JARS OR SIMILAR CONTAINERS; LIQUID HANDLING
    • B67C—CLEANING, FILLING WITH LIQUIDS OR SEMILIQUIDS, OR EMPTYING, OF BOTTLES, JARS, CANS, CASKS, BARRELS, OR SIMILAR CONTAINERS, NOT OTHERWISE PROVIDED FOR; FUNNELS
    • B67C3/00—Bottling liquids or semiliquids; Filling jars or cans with liquids or semiliquids using bottling or like apparatus; Filling casks or barrels with liquids or semiliquids
    • B67C3/02—Bottling liquids or semiliquids; Filling jars or cans with liquids or semiliquids using bottling or like apparatus
    • B67C3/22—Details
    • B67C3/28—Flow-control devices, e.g. using valves
    • B67C3/287—Flow-control devices, e.g. using valves related to flow control using predetermined or real-time calculated parameters

Definitions

  • the invention relates to a method for operating a measuring device arranged on a rotating, carousel-type, filling machine, for example, a measuring device serving for determining mass flow of a flowing medium and/or in the form of a Coriolis, mass flow measuring device, wherein the measuring device includes a measuring transducer of vibration-type, through which medium flows, at least at times.
  • the invention relates to an apparatus suitable for reducing the method to practice and/or embodied as a carousel-type, filling machine.
  • the containers for example, bottles, ampoules, glasses, cans or the like, to be filled with a charge of a medium, such as a solvent, a lacquer or paint, a cleaning agent, a drink, a medicine or the like, are supplied to the rotary filler one after the other via an appropriate feed system.
  • a medium such as a solvent, a lacquer or paint, a cleaning agent, a drink, a medicine or the like
  • the actual filling procedure is accomplished during a time span in which the container of interest is located within a dispensing station installed on the rotary filler below a filling tip dispensing the medium. After being filled with an, as much as possible, highly precisely dosed charge of medium, the containers leave the rotary filler and are automatically conveyed further.
  • Typical throughput rates of such carousel-type, filling machines can lie quite easily in the order of magnitude of 20,000 containers per hour, wherein the actual filling step and, associated therewith, the actual measuring phase, in which medium to be measured flows through the measuring transducer, is set from a few seconds to less than a second. Preceding this measuring phase, and, accordingly, also, subsequently, a ready-phase of the measuring transducer exists, in which no medium flows through the measuring transducer, i.e. no medium is dosed.
  • in-line measuring devices which ascertain, highly accurately and in real-time, the charge dosed during the corresponding filling phase, such being accomplished by means of directly measured and internally integrated flow rates of the medium allowed to flow therefor through a measuring transducer of the measuring device serving for the physical-to-electrical transducing of the measured variable to be registered, and so enabling a correspondingly fast and exact control of the filling process.
  • in-line measuring devices for example, comprising a measuring transducer of vibration-type or with a measuring transducer of the magneto-inductive type
  • In-line measuring devices with a measuring transducer of the magneto-inductive type are, moreover, sufficiently described e.g. in EP-A 1 039 269, U.S. Pat. No. 6,031,740, U.S. Pat. No. 5,540,103, U.S. Pat. No. 5,351,554, or U.S. Pat. No.
  • in-line measuring devices especially in-line measuring devices constructed as Coriolis, mass flow measuring devices, with a measuring transducer of vibration-type are described at length and in detail in, among others, WO-A 03/095950, WO-A 03/095949, WO-A 02/37063, WO-A 01/33174, WO-A 00/57141, WO-A 99/39164, WO-A 98/07009, WO-A 95/16897, WO-A 88/03261, US-A 2005/0139015, US 2003/0208325, U.S. Pat. No. 7,181,982, U.S. Pat. No. 7,040,181, U.S. Pat.
  • the measuring transducers include, in each case, at least one measuring tube, which is held in a support frame, formed, most often, as a closed, transducer housing, and which includes a bent and/or straight, tube segment.
  • this tube segment is excited during operation by means of an electromechanical exciter mechanism, such that it executes oscillations, in order to produce reaction forces correspondingly representative of the measured variable, for example, mass flow rate.
  • measuring transducers of vibration-type have, additionally, a sensor arrangement reacting to movements of the tube segment.
  • mass flow measuring devices measuring mass flow rates, for example, the measuring of the mass flow, or mass flow rate, of a medium flowing in a pipeline rests, as is known, on the fact that, when the medium to be measured is allowed to flow through at least one measuring tube inserted in a pipeline and oscillating during operation at least partially laterally to a measuring tube axis, Coriolis forces are induced in the medium.
  • This effects, that inlet-side and outlet-side regions of the measuring tube oscillate phase-shifted relative to one another. The size of this phase shift serves, in such case, as a measure of the mass flow.
  • the oscillations of the measuring tube are, therefore, registered by means of two oscillation sensors of the aforementioned sensor arrangement spaced from one another along the measuring tube. They convert the oscillations into oscillation measurement signals serving as primary signals of the measuring transducer, from whose phase shift relative to one another, the mass flow is derived.
  • oscillation measurement signals serving as primary signals of the measuring transducer, from whose phase shift relative to one another, the mass flow is derived.
  • the instantaneous density of the flowing medium can be measured, and, indeed, on the basis of an instantaneous and/or average frequency of at least one of the oscillation measurement signals delivered by the sensor arrangement.
  • a temperature of the medium is directly measured, in suitable manner, for example, by means of a temperature sensor arranged on the at least one measuring tube.
  • straight measuring tubes excited to torsional oscillations about a torsion oscillation axis essentially extending parallel to, or coinciding with, the particular measuring tube longitudinal axis, effect, that radial shear forces are produced in the medium guided therethrough, whereby, in turn, significant oscillatory energy is withdrawn from the torsional oscillations and dissipated in the medium. Resulting therefrom is a considerable damping of the torsional oscillations of the oscillating measuring tube, so that, to maintain them, the measuring tube must be supplied with additional electrical excitation power.
  • the measuring transducer which is usually provided in the form of a self-sufficient, conventional, in-line measuring device in compact construction (thus with, accommodated in a corresponding electronics-housing, an internal, measuring transducer electronics enabling the measuring operation and communication with superordinated operating units, such as a process control system), is appropriately connected via, respectively, inlet-side and outlet-side, most often, standardized connection elements, for example, screwed connections or flanges, to, respectively, medium-to-be-measured supplying and measured-medium removing, line segments of the pipeline system of the filling system conveying the medium during operation.
  • the measuring transducers are, in such case, so arranged within the rotary filler, that the flow axis connecting both of the connection elements of the measuring transducer and the axis of rotation of the rotary filler itself extend at an angle of less than 90°, or essentially parallel, relative to one another.
  • the measuring device electronics of conventional in-line measuring devices of the kind being discussed include, most often, a microcomputer delivering digital, measured values in real-time, along with corresponding volatile and non-volatile data memories for storing (on occasion, also for a retentive logging), also, of required digital measurement- or operating-data, such as the current angular velocity, with which the rotary filler is operating and with which, thus, the measuring transducer is orbiting, or revolving, around the axis of rotation, internally ascertained and/or externally transmitted to the pertinent in-line measuring device, for the safe proceeding of the filling process.
  • a possible cause for such measuring inaccuracies of flow measuring, in-line, measuring devices can, as discussed in, among others, also the initially mentioned U.S. Pat. No. 7,181,982, U.S. Pat. No. 7,040,181, U.S. Pat. No. 6,910,366, U.S. Pat. No. 6,880,410, U.S. Pat. No. 6,505,519, U.S. Pat. No. 6,311,136 or U.S. Pat. No. 5,400,657, lie, for example, in the fact that the medium to be measured can be composed, for process reasons, of two or more phases, for example, as with gas- and/or solids-bearing liquid, wherein the solids can be granular material or powder.
  • This cross-sensitivity of flow measuring, in-line measuring devices to angular and/or orbital velocity around the axis of rotation of the rotary filler, or its RPM can, for example, be related to the fact that, accompanying the orbital movement of the affected measuring transducer, acceleration forces, compared to a resting measuring transducer in otherwise comparable measuring situation, unavoidably acting on the measuring transducer and, thus, also on the therein conveyed medium, can effect a small deformation of the flow- and/or density-profile, this, especially, also in the aforementioned case of a medium composed of two or more phases.
  • the accuracy of measurement degraded under the aforementioned circumstances shows up, in special measure, due to a resultantly variable zero point of the affected measuring device, thus in such a way, that the measured value, for example, the instantaneous mass flow rate or the integrated mass flow delivered by the measuring transducer electronics also has a deviation dependent on RPM.
  • the primary measurement signals such as are delivered by measuring transducers installed on rotary fillers, such as, for instance, the oscillation measurement signals of Coriolis, mass flow measuring devices, for a highly exact measuring of the respective physical flow parameters, cannot be used, without further corrective measures also taking into consideration the rotational movement, this being true the more so since such in-line measuring devices can be exposed, process dependently, at the same time also to two- or multi-phase flows of medium.
  • This makes it necessary to take into consideration, in suitable manner, when measuring flow, parameters, such as acceleration forces and RPM changes, or parameters derived therefrom, disturbingly influencing the accuracy of measurement.
  • the invention resides in a method for operating a measuring device arranged on a rotating, carousel-type, filling machine and including a measuring transducer of vibration-type, through which a medium flows, at least at times, especially a measuring device serving for determining mass flow of a flowing medium and/or formed as a Coriolis, mass flow measuring device, which method includes steps as follows:
  • the invention resides in an apparatus, especially an apparatus suited for reducing the method to practice and/or embodied as a carousel-type filling machine, which apparatus includes:
  • such further includes a step of ascertaining a correction value for the primary signal of first class based on the primary signal of second class.
  • the correction value is correlated with an instantaneous angular velocity, with which the at least one measuring transducer measuring tube, through which medium is flowing, is moved around the axis of rotation of the carousel-type filling machine, and/or the correction value represents an influence of the movement of the at least one measuring transducer measuring tube around the axis of rotation on primary signals, especially the at least one primary signal of first class, delivered by the measuring transducer.
  • such further includes a step of ascertaining an angular velocity, with which the at least one measuring transducer measuring tube, through which medium is flowing, is moved around the axis of rotation of the carousel-type filling machine.
  • Developing this embodiment of the method further, it is additionally provided, that the at least one measured value is ascertained taking into consideration the angular velocity.
  • the medium to be measured is, at times, prevented from flowing through the at least one measuring transducer measuring tube.
  • such further includes a step of using the measuring transducer, while such is vibrating, but medium to be measured is not flowing therethrough, for producing also the at least one primary signal of second class.
  • such further includes a step of filling a containment on the outlet side of the measuring transducer with medium allowed to flow through the at least one measuring tube.
  • such further includes a step of using at least one additional measuring transducer, likewise orbiting around the axis of rotation of the carousel-type filling machine, and including at least one momentarily vibrating measuring tube, through which, however, medium to be measured is not flowing, especially a measuring tube of essentially equal construction to that momentarily containing flowing medium to be measured, for producing the at least one primary signal of second class.
  • the measuring transducer electronics ascertains, based at least on the primary signal of second class, especially reoccurringly, at least one correction value for the primary signal of first class.
  • the at least one measuring transducer electronics ascertains the correction value based also on the primary signal of first class delivered by the first measuring transducer, especially instantaneously and/or during its measuring phase.
  • the measuring transducer electronics ascertains the measured value under application of both the primary signal of first class delivered by the first measuring transducer during its measuring phase as well as also under application of the correction value.
  • the correction value delivered by the measuring transducer electronics corresponds to a measured, especially instantaneous or average, flow rate, especially a mass flow rate or a volume flow rate, which represents medium seemingly flowing through the measuring transducer in the ready phase.
  • the correction value delivered by the measuring transducer electronics correlates with an instantaneous angular velocity, with which the at least one measuring tube of the first measuring transducer is moved around the axis of rotation, and/or the correction value instantaneously represents an influence of the movement of the at least one measuring tube of the first measuring transducer around the axis of rotation on primary signals delivered by the measuring transducer, especially the primary signal of first class delivered during the measuring phase.
  • the at least one correction value is ascertained, before the measuring phase of the first measuring transducer begins.
  • the at least one measuring transducer electronics stores the at least one correction value, at least at times, especially in a volatile data memory.
  • the at least one measured value delivered by the measuring transducer electronics represents a mass flow rate, especially an instantaneous or integrated mass flow rate, of medium actually flowing through the first measuring transducer in the measuring phase.
  • the measuring transducer electronics holds ready, at least at times, an RPM value, especially a reoccurringly ascertained and/or updated RPM value, which represents, instantaneously, an angular velocity, especially a current angular velocity, with which the at least one measuring tube orbits around the axis of rotation.
  • the first measuring transducer is connected via an inlet-side, first connection element, especially a screwed connection or a flange, to a line segment of a pipeline system supplying medium to be measured.
  • first connection element especially a screwed connection or a flange
  • second connection element especially a screwed connection or a flange
  • the first measuring transducer shows a flow axis connecting the two connection elements, wherein the first measuring transducer is so arranged within the apparatus, that its flow axis and the axis of rotation form an angle of less than 90°, or that the flow axis of the first measuring transducer is essentially parallel to the axis of rotation.
  • the at least one measuring tube is at least sectionally essentially straight.
  • the at least one measuring tube especially a tube segment thereof caused to vibrate during operation, is at least sectionally curved.
  • the at least one measuring transducer electronics is arranged in the immediate vicinity of the first measuring transducer and/or essentially rigidly connected therewith.
  • each of the measuring transducers shows a measuring transducer housing, which houses the at least one measuring tube.
  • the at least one measuring transducer electronics is accommodated in an associated electronics-housing.
  • the electronics-housing is mounted, especially essentially rigidly, on the measuring transducer housing of the first measuring transducer.
  • the apparatus further includes a control electronics for setting and monitoring an angular velocity, with which the at least one measuring tube of the first measuring transducer is moved around the axis of rotation.
  • the measuring transducer electronics and the control electronics communicate with one another, at least at times, during operation, especially wirelessly via radio.
  • the measuring transducer electronics can, during operation, at least at times, especially reoccurringly, transmit measured data, especially a measured value and/or a correction value for the primary signal of first class, to the control electronics, and/or the measuring transducer electronics can, during operation, at least at times, especially reoccurringly, receive control data generated by the control electronics, especially a current angular velocity with which the at least one measuring tube of the first measuring transducer is moved around the axis of rotation.
  • the measuring transducer electronics during operation, at least at times, stores an RPM value, especially a digital RPM value and/or an RPM value generated externally of the measuring transducer electronics, wherein the RPM value represents, instantaneously, an angular velocity, with which the at least one measuring tube of the first measuring transducer is moved around the axis of rotation.
  • the measuring transducer electronics ascertains the at least one measured value and/or the correction value for the at least one primary signal of first class, under application of the RPM value.
  • the first measuring transducer delivers also the primary signal of second class.
  • the first measuring transducer generates the primary signal of second class during an, especially periodically reoccurring, ready phase, in which medium to be measured does not flow through the at least one measuring tube of the first measuring transducer.
  • the measuring transducer electronics ascertains the at least one measured value based both on the primary signal of first class delivered by the first measuring transducer during its measuring phase as well as also based on the primary signal of second class delivered by the first measuring transducer during its ready phase.
  • the first measuring transducer is a measuring transducer of vibration-type, in the case of which measuring transducer the at least one measuring tube is caused to vibrate, at least at times, for producing oscillation measurement signals serving as primary signals.
  • the medium to be measured flows through the at least one measuring tube of the first measuring transducer during its measuring phase and the at least one measuring tube of the first measuring transducer is caused to vibrate for the purpose of generating at least a first oscillation measurement signal serving as primary signal of first class and representing vibrations of the at least one measuring tube.
  • the measuring tube especially that of the first measuring transducer, serving for generating the at least one primary signal of second class, is likewise caused to vibrate and a second oscillation measurement signal representing vibrations of said measuring tube serves as primary signal of second class.
  • the at least one measuring transducer electronics based on the primary signal of first class delivered by the first measuring transducer during its measuring phase as well as based on the primary signal of second class, ascertains a difference value, which represents a difference between an oscillation frequency, especially an instantaneous or average oscillation frequency, with which the at least one measuring tube of the first measuring transducer is caused to vibrate during its measuring phase, and an oscillation frequency, especially an average oscillation frequency, with which the at least one measuring tube serving for generating the primary signal of second class is caused to vibrate.
  • the first measuring transducer delivers, during its measuring phase, a first primary signal of first class, which represents inlet-side vibrations of the at least one measuring tube, and, wherein the first measuring transducer, especially concurrently with the first primary signal, delivers at least one second primary signal of first class, which represents outlet-side vibrations of the at least one measuring tube.
  • the at least one measuring transducer electronics ascertains, based on the first and second primary signals of first class delivered by the first measuring transducer during its measuring phase, additionally, a phase difference between inlet-side and outlet-side vibrations of the at least one measuring tube corresponding to a mass flow rate of the medium flowing in the at least one measuring tube.
  • at least one measuring transducer electronics ascertains, additionally, the at least one measured value, based on the phase difference, especially a measured value instantaneously representing mass flow rate of the medium flowing in the at least one measuring tube of the first measuring transducer.
  • the at least one measuring tube of the first measuring transducer is caused to vibrate also during the ready phase of the first measuring transducer for the purpose of generating of the at least one primary signal of second class.
  • the measuring transducer is a measuring transducer of vibration-type
  • the first measuring transducer delivers, during its ready phase, a first primary signal of second class, which represents inlet-side vibrations of the at least one measuring tube during the ready phase
  • the first measuring transducer delivers, especially concurrently with the first primary signal of second class, at least a second primary signal of second class, which represents outlet-side vibrations of the at least one measuring tube during the ready phase.
  • the at least one measuring transducer electronics ascertains the at least one measured value based on an oscillation frequency corresponding to a density of the medium guided in the at least one measuring tube, especially an instantaneous or average oscillation frequency, with which the at least one measuring tube is caused to vibrate during operation of the first measuring transducer, especially during its measuring phase. Additionally, it is, in such case, provided, that the at least one measuring transducer electronics ascertains, on the basis of the primary signal of first class, the oscillation frequency, with which the at least one measuring tube of the first measuring transducer is caused to vibrate during its measuring phase.
  • the at least one measuring transducer electronics generates the at least one measured value based on an oscillation frequency corresponding to a density of the medium guided in the at least one measuring tube, especially an instantaneous or average oscillation frequency, with which the at least one measuring tube of the first measuring transducer is caused to vibrate during its ready phase. Additionally, it is, in such case, provided, that the at least one measuring transducer electronics ascertains, on the basis of the primary signal of second class, the oscillation frequency, with which the at least one measuring tube of the first measuring transducer is caused to vibrate during its ready phase.
  • the first measuring transducer is a measuring transducer of magneto-inductive type, in the case of which measuring transducer, a magnetic field passes through the at least one measuring tube, at least at times, especially during the measuring phase, for producing voltage measurement signals serving as primary signals and voltages induced in the medium are sensed by means of at least two electrodes, especially electrodes galvanically and/or capacitively coupled to the medium.
  • the apparatus further includes at least a second measuring transducer spaced from the first measuring transducer, especially a second measuring transducer structurally and functionally equal to the first measuring transducer.
  • the second measuring transducer includes at least one measuring tube, through which medium does not, at least at times, flow and which, during operation, is likewise moved around the axis of rotation, and that the second measuring transducer delivers, at least at times, primary signals, which correspond to at least one measured variable of medium guided in its at least one measuring tube.
  • the at least one measuring tube of the second measuring transducer which measuring tube is moved around the axis of rotation, does not have medium flowing through it during a ready phase, especially a periodically reoccurring ready phase, of the second measuring transducer.
  • the primary signal of second class is generated by the second measuring transducer during its ready phase.
  • the measuring transducer electronics ascertains the at least one measured value based both on the primary signal of first class delivered by the first measuring transducer during its measuring phase, as well as also based on the primary signal of second class delivered by the second measuring transducer during its ready phase.
  • the second measuring transducer delivers, during a measuring phase, especially a periodically reoccurring measuring phase, in which medium to be measured flows through the measuring tube, at least one primary signal of first class, which corresponds to a measured variable of the medium flowing in the associated at least one measuring tube.
  • the measuring tube of the measuring transducer generating the primary signal of second class is filled during its ready phase at least partially with essentially the same medium, which is allowed to flow in the at least one measuring tube of the measuring transducer generating, during its measuring phase, the primary signal of first class.
  • the at least one measuring tube of the measuring transducer generating, during its ready phase, the primary signal of second class is filled only partially with essentially the same medium, which is allowed to flow in the at least one measuring tube of the measuring transducer generating, during its measuring phase, the primary signal of first class.
  • the at least one measuring tube of the measuring transducer generating, during its ready phase, the primary signal of second class is filled, at least partially, with another medium, than is allowed to flow in the at least one measuring tube of the measuring transducer generating the primary signal of first class during its measuring phase.
  • the at least one measuring tube of the measuring transducer generating, during its ready phase, the primary signal of second class is filled, especially exclusively or at least predominantly, with gas, especially nitrogen or air.
  • a starting time in the case of which the ready phase of the measuring transducer generating the primary signal of second class begins, is placed timewise before a starting time, in the case of which the measuring phase of the measuring transducer generating the primary signal of first class begins.
  • a stop time in the case of which the ready phase of the measuring transducer generating the primary signal of second class ends, is placed timewise before a stop time, in the case of which the measuring phase of the measuring transducer generating the primary signal of first class ends.
  • the stop time in the case of which the ready phase of the measuring transducer generating the primary signal of second class ends, is placed timewise before the starting time, in the case of which the measuring phase of the measuring transducer generating the primary signal of first class begins.
  • the correction value delivered by the measuring transducer electronics corresponds to a measured flow rate, especially an instantaneous or average measured flow rate, especially a mass flow rate or a volume flow rate, which represents medium seemingly flowing in the ready phase through the measuring transducer.
  • the apparatus further includes at least one valve setting a flow through the at least one measuring transducer measuring tube, especially a valve arranged on the outlet side of the first measuring transducer.
  • the at least one valve is controlled by means of the at least one measuring transducer electronics, especially under application of the at least one measured value, and/or that the at least one measuring transducer electronics monitors the at least one valve, especially under application of the at least one primary signal of second class and/or a correction value derived therefrom for the at least one primary signal of first class, especially as regards a closing behavior thereof.
  • the apparatus includes a plurality of measuring transducers, especially measuring transducers which are structurally and functionally equal to the first measuring transducer, of which each includes at least one measuring tube arranged spaced from the at least one measuring tube of the first measuring transducer, especially along a shared circumference, and, likewise, in each case, moved around the axis of rotation.
  • each of the measuring transducers delivers, at least at times, primary signals, which correspond to at least one measured variable of the medium guided in the at least one, associated measuring tube, and/or that medium to be measured flows through the at least one measuring tube moved around the axis of rotation of each of the measuring transducers during a measuring phase, especially a periodically reoccurring measuring phase, of the associated measuring transducer.
  • each of the measuring transducers can deliver, during its measuring phase, concurrently, primary signals of first class, which, in each case, correspond to the at least one measured variable to be registered for the medium guided in the at least one, associated, measuring tube.
  • a plurality of the measuring transducers deliver, during a respective ready phase, primary signals of second class, which correspond to at least one measured variable of the medium guided in the at least one, associated, measuring tube.
  • a plurality of the measuring transducers deliver, concurrently, primary signals of second class.
  • each of the measuring transducers includes an associated measuring transducer electronics, especially a measuring transducer electronics accommodated, in each case, in a separate electronics-housing.
  • At least two of the measuring transducer electronics communicate with one another during operation, especially wirelessly per radio and/or by hardwire, especially for sending and/or receiving measured values and/or for sending and/or receiving correction values for primary signals produced by means of measuring transducers.
  • a basic idea of the invention is to ascertain, during ongoing operation of rotary fillers, the actual extent of the disturbing parameters influencing the measuring as a result of the rotational movement of the rotary filler, such as, for instance, RPM-dependent, accelerative forces, on the primary signals of measuring transducers rotating in the above sense, primary signals won during a measuring phase defined by the actual dosing procedure and thus primary signals carrying both the information concerning the measured variable actually to be registered, such as, for instance, mass flow rate and/or integrated mass flow, as well as also information concerning the disturbance, by providing that, additionally, another primary signal generated during a ready phase with the same measuring transducer, and/or with an equally moved, other, however, same-type, especially structurally and functionally equal, measuring transducer, is evaluated or utilized for the actual measuring.
  • the measuring transducer dependent on how the process operates, is subjected during the ready phase, indeed, to essentially the same disturbance as during the preceding, and/or next, measuring phase, while, in the ready phase, no medium is flowing through, so that primary signals generated during times of the ready phase represent only the disturbance to be compensated, for example, in the form of a flow rate seemingly suggesting that medium is flowing through the measuring transducer in the ready phase.
  • the invention utilizes, in such case, the special circumstance, dependent on the filling process, that, in a phase of the procedure, in which the flow rate—as a result of knowingly closed filling valves and/or as a result of knowingly emptied measuring tubes—equals zero and, as a result, is defined, so that, in the therewith corresponding, ready phase of the measuring transducer, the then generated primary signal, with, in the case of measuring transducers of vibration-type, for example, measuring tube still vibrating, should actually signal no medium to be flowing, so that flow rates ascertained based on this primary signal ought actually to equal zero.
  • Any primary signals or measured values deviating therefrom should correspond, thus, essentially to measuring errors present during the preceding and/or subsequent, actual measuring phase of this or another measuring transducer and can, thus, correspondingly—depending on sign, for example, additively, or subtractively—enter at least into the pertinent next measurement result, for example, in the form of a zero-point calibration automatically performed in the associated measuring transducer electronics.
  • the zero-point currently registered for the measuring device or its measuring transducer as a result of corresponding measurements during its ready phase can, depending on computing speed of the involved measuring transducer electronics, be applied in one of the next-following measuring phases of the corresponding measuring transducer and, thus, after a zero-point calibration performed correspondingly near in time, be appropriately taken into consideration in the measuring of flow for further dosing, and, if conditions require, also in a corresponding correction of a filling-balance produced over a longer period of time.
  • the currently ascertained zero-point or measuring errors or a correction factor correspondingly compensating such can be appropriately taken into consideration already for error correction in a subsequent measuring, which is performed in one of the next filling phases of the rotary filler by means of another measuring transducer first transferred from its ready phase into the measuring phase.
  • an option is, moreover, appropriately to average individual zero-points and/or zero-point offsets or correction factors appropriately compensating such, as obtained in the above-described manner, over a number of revolutions and/or by means of a plurality of measuring transducers in their ready phases.
  • a corresponding alarm can be triggered for suitably signaling a malfunctioning rotary filler, for example, as a result of a leaking valve and/or a defective measuring transducer, and/or a defective filling process, for example, as a function of properties of the medium differing from corresponding quality specifications.
  • FIG. 1 a schematic, plan view of a carousel-type filling machine
  • FIG. 2 a schematic, elevational view of a dispensing station of a carousel-type, filling machine as in FIG. 1 .
  • FIG. 1 shows schematically a plan view onto a carousel-type filling machine RF serving for the sequential filling of containments, such as, for instance, bottles, cups, ampoules or the like, with, in each case, a defined amount of a medium, especially a medium which is, at least partially or predominantly liquid.
  • the medium can, in such case, be practically any flowable, dosable material, such as a low-viscosity liquid, or a pasty liquid or e.g. even a granular material or powder.
  • the carousel-type filling machine RF includes a carousel K (here embodied as a rotor), on which are arranged, distributed uniformly along a circumference, a plurality of essentially structurally and functionally equal, especially identical, dispensing stations DS 1 -DSn.
  • the dispensing stations orbit, during operation of the carousel-type filling machine, in the case of driving of the carousel K about a central axis of rotation RA, on an orbital path correspondingly defined by the carousel K and the arrangement of the corresponding dispensing stations (the path is, thus, here, circular), and, indeed, with an angular velocity held essentially constant, at least over a period of time of a number of revolutions.
  • the containments to be filled are sequentially transferred in suitable manner to the carousel K and to the, in each case, assigned dispensing station via a supply system, for example, formed by means of a conveyor belt and a so-called infeed star.
  • a supply system for example, formed by means of a conveyor belt and a so-called infeed star.
  • Each containment is filled during a filling phase marking the actual filling procedure at each dispensing station, during which medium is allowed to flow into the intended containment, until a pre-defined amount of filling is reached.
  • each of the containments is taken by a removal system, formed, for example, by means of a so-called ouffeed star and a removal belt, possibly also already suitably sealed, and transferred to the next station for additional handling.
  • the carousel-type filling machine includes, in the example of an embodiment shown here, 17 such dispensing stations DS 1 -DSn moved around the axis of rotation RA, of which FIG. 2 shows, in a schematic, elevational view, a representative first dispensing station DS 1 with a first measuring transducer MT 1 of the carousel-type filling machine and, located below such, a containment BL momentarily to be filled, as well as a second dispensing station DS 2 with a second measuring transducer MT 2 (essentially structurally and functionally equal to the first measuring transducer) of the carousel-type filling machine; however, there is no containment at station DS 2 .
  • FIG. 2 shows, in a schematic, elevational view, a representative first dispensing station DS 1 with a first measuring transducer MT 1 of the carousel-type filling machine and, located below such, a containment BL momentarily to be filled, as well as a second dis
  • the measuring transducer MT 1 associated with the first dispensing station DS 1 is in a measuring phase, which reoccurs essentially periodically, as a function of the operation.
  • medium to be dosed, and, thus, to be measured flows through the measuring transducer MT 1 .
  • measuring transducer MT 2 associated with the second dispensing station DS 2 is in a ready phase, which likewise reoccurs essentially periodically, as a function of the operation.
  • the ready phase medium to be dosed and, thus, measured does not flow through the measuring transducer.
  • each of the dispensing stations of the carousel-type filling machine includes, besides a measuring transducer, through which medium flows, at times, during operation, additionally, a valve V arranged on the outlet side of the measuring transducer, as well as a filling tip FTP connected to the valve.
  • Developing the typical measuring transducer MT 1 further, it includes at least one measuring tube T 1 inserted into the course of the pipeline and extending between an inlet of the measuring transducer for inflowing medium and an outlet of the measuring transducer for outflowing medium.
  • measuring tube T 1 is moved around the axis of rotation RA. In the illustrated case, the measuring tube T 1 is moved in a circular orbit, predominantly with an angular velocity held essentially constant. For process reasons, the medium to be measured is allowed to flow only at times through the measuring tube.
  • valve V shown in FIG. 2 serving as outlet-valve also a valve serving as inlet-valve can be provided, in each case, in the dispensing stations, arranged on the inlet side of the measuring transducer, for example, for enabling also an emptying of the measuring transducer outside of its measuring phase and, thus, during its ready phase.
  • a valve serving as inlet-valve can be provided, in each case, in the dispensing stations, arranged on the inlet side of the measuring transducer, for example, for enabling also an emptying of the measuring transducer outside of its measuring phase and, thus, during its ready phase.
  • it can be of advantage, for example, for purposes of sterilization of the measuring tube, during the ready phase of the measuring transducer, to fill its at least one measuring tube temporarily with CO 2 , nitrogen or some other inert gas.
  • the containment BL to be filled is held under its filling tip FTP during the filling phase of the pertinent dispensing station DS 1 .
  • the containment BL is, in such case, conveyed on a rotary table RT of the carousel K and can, in case necessary, all-the-while be held by an additional holder HDR holding, for example, a possibly present, bottle neck.
  • the current fill-level in the containment BL is indicated by a wavy line.
  • the medium to be filled into the containment BL is supplied via the pipeline PL from a reservoir (not shown).
  • the at least one measuring tube T 1 of the measuring transducer MT 1 is additionally accommodated in a protective measuring transducer housing of the measuring transducer and can itself be at least sectionally essentially straight and/or at least sectionally curved.
  • the at least one measuring tube (and, as a result, the associated measuring transducer MT) is connected via a medium supplying line segment PL of a pipeline system with a reservoir, such as a tank, (not shown), storing the medium in suitable manner.
  • the mentioned inlet valve is interposed in the segment PL.
  • provided additionally on the outlet side is a further line segment implementing the connection of outlet valve V and filling tip FTP.
  • the connecting of the measuring transducer to the line segments can be accomplished in conventional manner via corresponding inlet- and outlet-side, especially standardized, connection elements, such as appropriate screwed connections or flanges.
  • the measuring transducers here, representatively, the first measuring transducer MT 1 and the second measuring transducer MT 2 —are additionally so placed in their respective dispensing stations, that the axis of rotation RA, around which the dispensing stations are guided—here circular orbiting and predominantly with an angular velocity held essentially constant—extends essentially parallel to a longitudinal axis of a particular measuring transducer connecting the inlet and the outlet of the measuring transducer or its associated connection elements.
  • the measuring transducer can, in case necessary, also be so arranged within the carousel-type filling machine RF, that the flow axis extending between the connection elements of each of the measuring transducers and the axis of rotation the carousel-type filling machine forms an angle of less than 90°.
  • the measuring transducer MT 1 is, additionally, electrically connected to at least a first measuring transducer electronics ME 1 serving for operating the measuring transducer, as well as also for producing measured values representing, especially digitally, the at least one measured variable. Accordingly, in the case of the situation shown in FIG. 2 , the amount of medium momentarily already filled or still to be filled into the containment BL can be ascertained directly on-site by means of the measuring transducer electronics ME 1 connected to the measuring transducer MT 1 momentarily residing in the measuring phase.
  • the measuring transducer electronics ME 1 and the measuring transducer MT 1 can—such as schematically illustrated in FIG. 2 and quite usual for such dispensing stations—be united to a self-sufficient measuring system CDM 1 , for example, formed as an in-line measuring device in compact construction, in the case of which the measuring transducer electronics ME 1 is accommodated in an electronics-housing suitably affixed externally on the measuring transducer, for example, on its, as conditions require, existing measuring-transducer housing.
  • a self-sufficient measuring system CDM 1 for example, formed as an in-line measuring device in compact construction, in the case of which the measuring transducer electronics ME 1 is accommodated in an electronics-housing suitably affixed externally on the measuring transducer, for example, on its, as conditions require, existing measuring-transducer housing.
  • the measuring transducer electronics MT 1 is, additionally, so designed, that it is connected to a fieldbus system and, thus, linked into a superordinated electronic data transmission and data processing system, for example, a programmable logic control or a plant-spanning, process control system PCS controlling the carousel-type filling machine.
  • Used for this can be standard interfaces correspondingly established, for example, in industrial measurements- and automation-technology, such as, for instance, PROFIBUS, FOUNDATION FIELDBUS, CAN-BUS, MODBUS, etc. . . .
  • an external energy supply serving to supply the measuring transducer electronics can be connected to the fieldbus system, in order to supply the measuring system with energy, in manner known to those skilled in the art, directly, especially also exclusively, via a fieldbus system.
  • a corresponding second measuring transducer electronics ME 2 essentially structurally and functionally equal to the first measuring transducer electronics ME 1 .
  • each of the measuring transducers in the individual dispensing stations includes an associated measuring transducer electronics (here, also, in each case, accommodated in a separate electronics-housing), according to an embodiment of the invention, it is additionally provided, that at least two of the measuring transducer electronics communicate with one another during operation—wirelessly per radio and/or hardwired.
  • the measuring transducer electronics of two measuring transducers operated, momentarily, in each case, in a ready phase can transmit or receive internally stored, measured values and/or corresponding internal correction values for the primary signals to be produced by means of the measuring transducer.
  • the carousel-type filling machine RF especially also the RPM, with which the dispensing stations are moved around the axis of rotation RA, and/or the respective start times, at which the individual filling phases of the dispensing stations are begun, and, associated therewith, also the respective start times, at which the measuring phases of the, in each case, associated measuring transducer are begun, are all, in an embodiment of the invention, controlled and/or monitored with the assistance of a measured-values-processing, superordinated control electronics embodied, for example, in the form of a programmable logic controller PLC.
  • The, for example, modularly embodied, control electronics can be arranged, at least partially, both on the carousel K as well as also externally of the same.
  • control electronics is advantageously also electrically connected with the respective measuring transducer electronics of the dispensing stations via appropriate signal lines SL, if conditions require, also with interposing of appropriate slip-ring contacts.
  • control electronics and measuring transducer electronics can also communicate with one another wirelessly per radio.
  • the measuring transducer electronics can, however, also be of advantage to have the measuring transducer electronics also send control commands—wirelessly per radio and/or hardwired—directly to the at least one valve of the, in each case, associated dispensing station.
  • the control electronics in an additional embodiment of the invention, is connected with a rotational speed sensor RS, which, in the shown example of an embodiment, is arranged on the edge of the rotary table RT, and registers the rotational movement of the carousel K, for example, optically or inductively, and reoccurringly generates, and provides to the control electronics, an RPM value, especially a digital RPM value, representing a currently measured RPM of the carousel.
  • a rotational speed sensor RS which, in the shown example of an embodiment, is arranged on the edge of the rotary table RT, and registers the rotational movement of the carousel K, for example, optically or inductively, and reoccurringly generates, and provides to the control electronics, an RPM value, especially a digital RPM value, representing a currently measured RPM of the carousel.
  • measuring transducer MT can be, as quite usual in the case of such carousel filling machines, a magneto-inductive flow transducer or however also a measuring transducer of vibration-type, especially a Coriolis, mass flow transducer, with a single measuring tube vibrating during operation or with two measuring tubes vibrating during operation.
  • Construction and operation of magneto-inductive measuring transducers, as well as also measuring transducers of vibration-type are sufficiently known to those skilled in the art, so that such need not be explored further in greater detail.
  • magneto-inductive measuring transducers are described at length in, among others, the initially mentioned EP-A 1 039 269, U.S. Pat. No. 6,031,740, U.S. Pat. No.
  • each of the measuring transducers especially measuring transducers essentially structurally and functionally equally formed, be each, now, of vibration-type or of magneto-inductive type, produces, at least at times, one primary signal, or two or more primary signals, s 1 , s 2 , for example, in the form of, as regards amplitude and/or frequency, variable voltages, which correspond to at least one physical, measured variable suited for control of the filling process, for example, a flow velocity, a mass flow m, a volume flow v and, if conditions require, also to a density ⁇ and/or a viscosity ⁇ , of the medium located in the measuring tube, and which are converted by the respective measuring transducer electronics, especially during the filling phase of the associated dispensing station, into the corresponding measured values.
  • the exciter mechanism of the measuring transducer may be, for example, an electro-mechanical or an electro-magnetic, exciter mechanism.
  • the respective measuring transducer is a measuring transducer of magneto-inductive type
  • a magnetic field is caused, in manner known to those skilled in the art, to pass, at least at times, through the at least one measuring tube for producing voltage measurement signals serving as primary signals, and voltages induced in the medium are tapped, in manner known to those skilled in the art, by means of at least two electrodes coupled, for example, galvanically and/or capacitively with the medium.
  • the primary signals are, as is known, oscillation measurement signals, which represent inlet-side or outlet-side oscillations of the at least one measuring tube of the respective measuring transducer.
  • the measuring tube is caused to vibrate, at least at times, during operation.
  • the inlet-side and outlet-side oscillations are correspondingly phase-shifted relative to one another.
  • the measuring transducer electronics Under application of the at least one primary signal delivered, at least at times, by the associated measuring transducer, the measuring transducer electronics—if conditions require, also in cooperation with at least one of the other measuring transducer electronics and/or in cooperation with the control electronics—updates, during operation, reoccurringly, the measured value X M required for the dosing of the predetermined amount of filling into the containment located currently in the dispensing station.
  • the measured value X M include: A flow rate in the measuring transducer, through which medium to be measured is momentarily flowing, or based on flow rate, an integrated flow, which, lastly, represents the amount so far actually dispensed into the containment, or, if conditions require, also a density of the medium.
  • the control electronics starts the filling procedure at each of the filling stations by opening the relevant valve and defines, thus, the beginning of the filling phase of the dispensing stations and, insofar, also the starting time of the measuring phases or the stopping time of the ready phases of the individual measuring transducers.
  • the measuring transducer electronics ascertain—if conditions require, in turn, in cooperation with at least one of the other measuring transducer electronics and/or the connected control electronics—based on the at least one updated measured value X M , a stopping time corresponding with the reaching of the predetermined amount of filling for the containment BL momentarily located in the dispensing station, defining the end of the current filling phase of the dispensing station and, associated therewith, also the end of the current measuring phase of the associated measuring transducer.
  • the corresponding stop command or the therewith corresponding close signal for the valve V which, lastly, again, prevents the medium to be measured from flowing through the at least one measuring transducer measuring tube, can, for example, be fed directly from the measuring transducer electronics ME 1 per switched output to the valve V.
  • the close signal for the valve V can be directly transmitted from the control electronics via signal line SL to the valve V; compare, in this connection, for example, also the initially mentioned WO-A 04/049641.
  • the measuring transducer electronics ascertains the current measured value X M not only based on the at least one primary signal (referred to herein as primary signal of first class) delivered by the measuring transducer during the measuring phase, but, instead, additionally also based on at least one primary signal (referred to herein as primary signal of second class), which is generated during a reoccurring, ready phase by a measuring transducer installed on the carousel-type filling machine and, thus, likewise orbiting around the axis of rotation RA.
  • primary signal of first class the at least one primary signal delivered by the measuring transducer during the measuring phase
  • primary signal of second class at least one primary signal
  • the primary signal of second class thus utilized likewise for ascertaining the respective measured value X M corresponds, according to the invention, to a primary signal, which is generated by means of a measuring transducer, indeed, likewise moved around the axis of rotation, whose at least one measuring tube, at times of generating said primary signal of second class, does not, however, have medium flowing through it.
  • the measuring transducers such as already mentioned, are, in each case, embodied as measuring transducers of vibration-type, is, in each case, one or a plurality of oscillation measurement signals, of which each registers vibrations, especially inlet- and outlet-side vibrations, of the at least one measuring tube, through which medium to be measured is momentarily flowing—thus in the respective measuring phase of the associated measuring transducer.
  • serving as primary signal of second class is, for example, such oscillation measurement signals, which represent, in each case, vibrations, especially inlet- and outlet-side vibrations, of at least one measuring tube orbiting around the axis of rotation of the carousel-type filling machine and not containing medium flowing through it, thus, for example, for the situation shown in FIG. 2 , also the measuring transducer MT 1 in a ready phase preceding its momentary measuring phase.
  • a correction value X K is ascertained for the primary signal of first class.
  • the correction value X K can be, for example, so ascertained that, based on the primary signal of second class, according to the same measuring method, such as has been used before for preliminary measured values X′ M generated in conventional manner only based on primary signals of first class—thus without taking into consideration the influences on the primary signals of first class accompanying the rotational movement of the carousel-type filling machine and/or changes of its RPM—, a corresponding auxiliary measured value X′ K is ascertained.
  • the auxiliary measured value X′ K corresponds essentially, thus, to a measured instantaneous or average flow rate, which represents medium seemingly flowing in the ready phase through the measuring transducer.
  • the apparent flow represented by the auxiliary measured value X′ K can, in such case, be brought about, for example, as a result of changes of RPM and therewith accompanying accelerations or deviations of the RPM from a corresponding default value and/or as a result of gas bubbles rising within the medium guided in the measuring tube.
  • the measuring transducer delivering the primary signal of second class can be, for example, the second measuring transducer MT 2 shown in FIG. 2 and/or, for example, also the measuring transducer, which instantaneously delivers the primary signal of first class for the purpose of ascertaining the current measured value for the situation shown in FIG. 2 , thus the measuring transducer MT 1 .
  • the primary signal of second class which is, as a result, used in the ascertaining of the current measured value, as the at least one correction value ascertained based on the primary signal of second class or as an auxiliary measured value ascertained earlier than the at least one correction value for the current primary signal of first class, is correspondingly held, for example, in a digital, volatile, data memory of the respective measuring transducer electronics and/or in a digital data memory of the control electronics, and, in the ascertaining of the current measured value, is caused to enter appropriately into the result.
  • the measuring transducer electronics sends to the control electronics during operation, at least at times, especially reoccurringly, measured data, for example, thus a measured value ascertained in a measuring phase and/or an auxiliary measured value ascertained in a ready phase and/or a corresponding correction value for the primary signal of first class.
  • the correction value correspondingly ascertained therefor in aforementioned manner correlates very strongly with an instantaneous angular velocity, with which the at least one measuring transducer measuring tube, through which medium is flowing, is moved around the axis of rotation of the carousel-type filling machine, and, indeed, in such a manner, that the magnitude of the correction value X K increases with rising RPM.
  • the correction value ascertained for the purpose of ascertaining of flow rates based on one or a plurality of primary signals of second class thus, can also serve as a measure for the current RPM of the carousel-type filling machine and can also be correspondingly taken into consideration in the control electronics for RPM-control.
  • the measuring transducer electronics during operation, at least at times, holds ready an, if conditions require, reoccurringly ascertained and/or updated, RPM value, which represents an, as much as possible, current angular velocity, with which the pertinent measuring transducer or its at least one measuring tube is orbiting momentarily around the axis of rotation.
  • RPM value represents an, as much as possible, current angular velocity, with which the pertinent measuring transducer or its at least one measuring tube is orbiting momentarily around the axis of rotation.
  • The, for example, a non-volatily stored, RPM value can, in such case, also have been generated externally of the measuring transducer electronics, for example, by means of the control electronics and/or by means of the aforementioned rotational speed sensor RS.
  • control data representing the RPM of the carousel K such as a desired value set for the RPM and/or an actually measured RPM value, are transmitted, timely, as much as possible thus before beginning a measuring phase, to the measuring transducer electronics associated with the pertinent measuring transducer.
  • particular ones of the correction values X K ascertained during operation can be utilized additionally for monitoring the carousel-type filling machine, for example, such that, within the control electronics, unallowably high deviations of one or a number of such correction values X K relative to earlier correspondingly defined reference values are detected.
  • a corresponding alarm signaling for example, a defective dispensing station, for example, as a result of a poorly closing valve, a deficient medium and/or a defective measuring system, can be generated, which, for example, is displayed on-site and/or at a remote, control station.

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EP2257490B1 (fr) 2012-06-27

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